18440203542 has 48 divisors (see below), whose sum is σ = 38282027520. Its totient is φ = 5920649280.

The previous prime is 18440203489. The next prime is 18440203553. The reversal of 18440203542 is 24530204481.

It is a super-2 number, since 2×18440203542² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 785223 + ... + 808365.

It is an arithmetic number, because the mean of its divisors is an integer number (797542240).

Almost surely, 2^18440203542 is an apocalyptic number.

18440203542 is an abundant number, since it is smaller than the sum of its proper divisors (19841823978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18440203542 is a wasteful number, since it uses less digits than its factorization.

18440203542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23309 (or 23268 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The spelling of 18440203542 in words is "eighteen billion, four hundred forty million, two hundred three thousand, five hundred forty-two".